P. Wals, G. Deceuninck, {. Boucher, and M. Ouakki. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 46 (8):
e75--77(April 2008)PMID: 18444843.
O. Bilukha, and N. Rosenstein. MMWR. Recommendations and Reports: Morbidity and Mortality Weekly Report. Recommendations and Reports / Centers for Disease Control, 54 (RR-7):
1--21(May 2005)PMID: 15917737.
M. Breukels, E. van der Zijde, M. van Tol, and G. Rijkers. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 34 (2):
191--7(January 2002)PMID: 11740707.
R. Tsang, M. Sill, S. Skinner, D. Law, J. Zhou, and J. Wylie. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (12):
1611--4(June 2007)PMID: 17516405.